My Add object actuator doesn't work
The actuator does work actually. If you turn on physics visualization you can see the collision box. But since the empty adding the object is parented to the armature, which is scaled down to 0.01, the object will also be added at an scale of 0.01. Thus it's just super tiny but still there.

To solve this issue you have to apply the armature's scale (&#9096; CtrlA). You will note that the armature's position will be off. To fix that you have to reset every bone's location (A to select all and &#9095; AltG to reset the location) and insert a keyframe for that (I and location). Do this for every keyframe of the armature.